SELECT 
  b.variant_name, 
  a.* 
FROM 
  cscart_product_option_variants AS a 
  LEFT JOIN cscart_product_option_variants_descriptions AS b ON b.variant_id = a.variant_id 
  AND b.lang_code = 'en' 
WHERE 
  1 
  AND a.option_id IN (20, 25) 
  AND a.status = 'A' 
ORDER BY 
  a.position, 
  a.variant_id

Query time 0.00155

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "39.52"
    },
    "ordering_operation": {
      "using_temporary_table": true,
      "using_filesort": true,
      "cost_info": {
        "sort_cost": "32.00"
      },
      "nested_loop": [
        {
          "table": {
            "table_name": "a",
            "access_type": "ALL",
            "rows_examined_per_scan": 32,
            "rows_produced_per_join": 1,
            "filtered": "3.12",
            "cost_info": {
              "read_cost": "3.68",
              "eval_cost": "0.10",
              "prefix_cost": "3.78",
              "data_read_per_join": "48"
            },
            "used_columns": [
              "variant_id",
              "option_id",
              "position",
              "modifier",
              "modifier_type",
              "weight_modifier",
              "weight_modifier_type",
              "point_modifier",
              "point_modifier_type",
              "status"
            ],
            "attached_condition": "((`mobikul_delivery_boy_livedemo`.`a`.`option_id` in (20,25)) and (`mobikul_delivery_boy_livedemo`.`a`.`status` = 'A'))"
          }
        },
        {
          "table": {
            "table_name": "b",
            "access_type": "ALL",
            "rows_examined_per_scan": 32,
            "rows_produced_per_join": 32,
            "filtered": "100.00",
            "using_join_buffer": "hash join",
            "cost_info": {
              "read_cost": "0.55",
              "eval_cost": "3.20",
              "prefix_cost": "7.52",
              "data_read_per_join": "24K"
            },
            "used_columns": [
              "variant_id",
              "lang_code",
              "variant_name"
            ],
            "attached_condition": "<if>(is_not_null_compl(b), ((`mobikul_delivery_boy_livedemo`.`b`.`variant_id` = `mobikul_delivery_boy_livedemo`.`a`.`variant_id`) and (`mobikul_delivery_boy_livedemo`.`b`.`lang_code` = 'en')), true)"
          }
        }
      ]
    }
  }
}