SELECT 
  cscart_product_feature_variant_descriptions.variant, 
  cscart_product_feature_variants.variant_id, 
  cscart_product_feature_variants.feature_id, 
  cscart_product_features_values.variant_id as selected, 
  cscart_product_features.feature_type, 
  cscart_seo_names.name as seo_name, 
  cscart_seo_names.path as seo_path 
FROM 
  cscart_product_feature_variants 
  LEFT JOIN cscart_product_feature_variant_descriptions ON cscart_product_feature_variant_descriptions.variant_id = cscart_product_feature_variants.variant_id 
  AND cscart_product_feature_variant_descriptions.lang_code = 'en' 
  INNER JOIN cscart_product_features_values ON cscart_product_features_values.variant_id = cscart_product_feature_variants.variant_id 
  AND cscart_product_features_values.lang_code = 'en' 
  AND cscart_product_features_values.product_id = 68 
  AND cscart_product_features_values.feature_id = cscart_product_feature_variants.feature_id 
  LEFT JOIN cscart_product_features ON cscart_product_features.feature_id = cscart_product_feature_variants.feature_id 
  LEFT JOIN cscart_seo_names ON cscart_seo_names.object_id = cscart_product_feature_variants.variant_id 
  AND cscart_seo_names.type = 'e' 
  AND cscart_seo_names.dispatch = '' 
  AND cscart_seo_names.lang_code = 'en' 
WHERE 
  1 
  AND cscart_product_feature_variants.feature_id IN (15, 16, 17) 
GROUP BY 
  cscart_product_feature_variants.variant_id 
ORDER BY 
  cscart_product_feature_variants.position, 
  cscart_product_feature_variant_descriptions.variant

Query time 0.00227

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "614723.93"
    },
    "ordering_operation": {
      "using_filesort": true,
      "grouping_operation": {
        "using_temporary_table": true,
        "using_filesort": false,
        "nested_loop": [
          {
            "table": {
              "table_name": "cscart_product_features_values",
              "access_type": "ALL",
              "rows_examined_per_scan": 343,
              "rows_produced_per_join": 3,
              "filtered": "1.00",
              "cost_info": {
                "read_cost": "34.88",
                "eval_cost": "0.34",
                "prefix_cost": "35.22",
                "data_read_per_join": "2K"
              },
              "used_columns": [
                "feature_id",
                "product_id",
                "variant_id",
                "lang_code"
              ],
              "attached_condition": "((`mobikul_delivery_boy_livedemo`.`cscart_product_features_values`.`product_id` = 68) and (`mobikul_delivery_boy_livedemo`.`cscart_product_features_values`.`feature_id` in (15,16,17)) and (`mobikul_delivery_boy_livedemo`.`cscart_product_features_values`.`lang_code` = 'en'))"
            }
          },
          {
            "table": {
              "table_name": "cscart_product_feature_variants",
              "access_type": "ALL",
              "rows_examined_per_scan": 158,
              "rows_produced_per_join": 3,
              "filtered": "0.63",
              "using_join_buffer": "hash join",
              "cost_info": {
                "read_cost": "11.76",
                "eval_cost": "0.34",
                "prefix_cost": "63.24",
                "data_read_per_join": "3K"
              },
              "used_columns": [
                "variant_id",
                "feature_id",
                "position"
              ],
              "attached_condition": "((`mobikul_delivery_boy_livedemo`.`cscart_product_feature_variants`.`feature_id` = `mobikul_delivery_boy_livedemo`.`cscart_product_features_values`.`feature_id`) and (`mobikul_delivery_boy_livedemo`.`cscart_product_feature_variants`.`variant_id` = `mobikul_delivery_boy_livedemo`.`cscart_product_features_values`.`variant_id`))"
            }
          },
          {
            "table": {
              "table_name": "cscart_product_features",
              "access_type": "ALL",
              "rows_examined_per_scan": 35,
              "rows_produced_per_join": 120,
              "filtered": "100.00",
              "using_join_buffer": "hash join",
              "cost_info": {
                "read_cost": "0.65",
                "eval_cost": "12.01",
                "prefix_cost": "75.89",
                "data_read_per_join": "51K"
              },
              "used_columns": [
                "feature_id",
                "feature_type"
              ],
              "attached_condition": "<if>(is_not_null_compl(cscart_product_features), (`mobikul_delivery_boy_livedemo`.`cscart_product_features`.`feature_id` = `mobikul_delivery_boy_livedemo`.`cscart_product_features_values`.`feature_id`), true)"
            }
          },
          {
            "table": {
              "table_name": "cscart_product_feature_variant_descriptions",
              "access_type": "ALL",
              "rows_examined_per_scan": 158,
              "rows_produced_per_join": 18967,
              "filtered": "100.00",
              "using_join_buffer": "hash join",
              "cost_info": {
                "read_cost": "3.60",
                "eval_cost": "1896.79",
                "prefix_cost": "1976.27",
                "data_read_per_join": "56M"
              },
              "used_columns": [
                "variant_id",
                "variant",
                "lang_code"
              ],
              "attached_condition": "<if>(is_not_null_compl(cscart_product_feature_variant_descriptions), ((`mobikul_delivery_boy_livedemo`.`cscart_product_feature_variant_descriptions`.`variant_id` = `mobikul_delivery_boy_livedemo`.`cscart_product_features_values`.`variant_id`) and (`mobikul_delivery_boy_livedemo`.`cscart_product_feature_variant_descriptions`.`lang_code` = 'en')), true)"
            }
          },
          {
            "table": {
              "table_name": "cscart_seo_names",
              "access_type": "ALL",
              "rows_examined_per_scan": 323,
              "rows_produced_per_join": 6126632,
              "filtered": "100.00",
              "using_join_buffer": "hash join",
              "cost_info": {
                "read_cost": "84.45",
                "eval_cost": "612663.21",
                "prefix_cost": "614723.93",
                "data_read_per_join": "9G"
              },
              "used_columns": [
                "name",
                "object_id",
                "type",
                "dispatch",
                "path",
                "lang_code"
              ],
              "attached_condition": "<if>(is_not_null_compl(cscart_seo_names), ((`mobikul_delivery_boy_livedemo`.`cscart_seo_names`.`object_id` = `mobikul_delivery_boy_livedemo`.`cscart_product_features_values`.`variant_id`) and (`mobikul_delivery_boy_livedemo`.`cscart_seo_names`.`type` = 'e') and (`mobikul_delivery_boy_livedemo`.`cscart_seo_names`.`dispatch` = '') and (`mobikul_delivery_boy_livedemo`.`cscart_seo_names`.`lang_code` = 'en')), true)"
            }
          }
        ]
      }
    }
  }
}