SELECT 
  *, 
  cscart_seo_names.name as seo_name, 
  cscart_seo_names.path as seo_path 
FROM 
  cscart_categories 
  LEFT JOIN cscart_category_descriptions ON cscart_category_descriptions.category_id = cscart_categories.category_id 
  AND cscart_category_descriptions.lang_code = 'en' 
  LEFT JOIN cscart_seo_names ON cscart_seo_names.object_id = 166 
  AND cscart_seo_names.type = 'c' 
  AND cscart_seo_names.dispatch = '' 
  AND cscart_seo_names.lang_code = 'en' 
WHERE 
  cscart_categories.category_id = 166 
  AND (
    cscart_categories.usergroup_ids = '' 
    OR FIND_IN_SET(
      0, cscart_categories.usergroup_ids
    ) 
    OR FIND_IN_SET(
      1, cscart_categories.usergroup_ids
    )
  )

Query time 0.00202

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "16045.61"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_categories",
          "access_type": "ALL",
          "rows_examined_per_scan": 84,
          "rows_produced_per_join": 8,
          "filtered": "10.00",
          "cost_info": {
            "read_cost": "8.41",
            "eval_cost": "0.84",
            "prefix_cost": "9.25",
            "data_read_per_join": "21K"
          },
          "used_columns": [
            "category_id",
            "parent_id",
            "id_path",
            "level",
            "company_id",
            "storefront_id",
            "usergroup_ids",
            "status",
            "product_count",
            "position",
            "timestamp",
            "is_op",
            "localization",
            "age_verification",
            "age_limit",
            "parent_age_verification",
            "parent_age_limit",
            "selected_views",
            "default_view",
            "product_details_view",
            "product_columns",
            "is_trash",
            "is_default",
            "category_type"
          ],
          "attached_condition": "((`mobikul_delivery_boy_livedemo`.`cscart_categories`.`category_id` = 166) and ((`mobikul_delivery_boy_livedemo`.`cscart_categories`.`usergroup_ids` = '') or (0 <> find_in_set(0,`mobikul_delivery_boy_livedemo`.`cscart_categories`.`usergroup_ids`)) or (0 <> find_in_set(1,`mobikul_delivery_boy_livedemo`.`cscart_categories`.`usergroup_ids`))))"
        }
      },
      {
        "table": {
          "table_name": "cscart_category_descriptions",
          "access_type": "ALL",
          "rows_examined_per_scan": 84,
          "rows_produced_per_join": 705,
          "filtered": "100.00",
          "using_join_buffer": "hash join",
          "cost_info": {
            "read_cost": "0.70",
            "eval_cost": "70.56",
            "prefix_cost": "80.51",
            "data_read_per_join": "2M"
          },
          "used_columns": [
            "category_id",
            "lang_code",
            "category",
            "description",
            "meta_keywords",
            "meta_description",
            "page_title",
            "age_warning_message"
          ],
          "attached_condition": "<if>(is_not_null_compl(cscart_category_descriptions), ((`mobikul_delivery_boy_livedemo`.`cscart_category_descriptions`.`category_id` = 166) and (`mobikul_delivery_boy_livedemo`.`cscart_category_descriptions`.`lang_code` = 'en')), true)"
        }
      },
      {
        "table": {
          "table_name": "cscart_seo_names",
          "access_type": "ALL",
          "rows_examined_per_scan": 226,
          "rows_produced_per_join": 159465,
          "filtered": "100.00",
          "using_join_buffer": "hash join",
          "cost_info": {
            "read_cost": "18.54",
            "eval_cost": "15946.56",
            "prefix_cost": "16045.61",
            "data_read_per_join": "264M"
          },
          "used_columns": [
            "name",
            "object_id",
            "company_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` = 166) and (`mobikul_delivery_boy_livedemo`.`cscart_seo_names`.`type` = 'c') and (`mobikul_delivery_boy_livedemo`.`cscart_seo_names`.`dispatch` = '') and (`mobikul_delivery_boy_livedemo`.`cscart_seo_names`.`lang_code` = 'en')), true)"
        }
      }
    ]
  }
}