SELECT 
  * 
FROM 
  cscart_categories 
  LEFT JOIN cscart_category_descriptions ON cscart_category_descriptions.category_id = cscart_categories.category_id 
WHERE 
  cscart_categories.category_id = 659

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "0.35"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_categories",
          "access_type": "const",
          "possible_keys": [
            "PRIMARY",
            "p_category_id"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "category_id"
          ],
          "key_length": "3",
          "ref": [
            "const"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "0.00",
            "eval_cost": "0.10",
            "prefix_cost": "0.00",
            "data_read_per_join": "10K"
          },
          "used_columns": [
            "category_id",
            "parent_id",
            "id_path",
            "level",
            "company_id",
            "storefront_id",
            "usergroup_ids",
            "guarantee_id",
            "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",
            "yml2_market_category",
            "yml2_offer_type",
            "yml2_type_prefix_select",
            "yml2_model_select",
            "yml2_type_prefix",
            "yml2_model",
            "ab__fn_category_status",
            "ab__fn_label_color",
            "ab__fn_label_background",
            "ab__fn_use_origin_image",
            "ab__lc_catalog_image_control",
            "ab__lc_landing",
            "ab__lc_subsubcategories",
            "ab__lc_menu_id",
            "ab__lc_how_to_use_menu",
            "ab__lc_inherit_control",
            "external_id",
            "services",
            "block_title",
            "block_subtitle",
            "block_utp_percent",
            "block_utp_line1",
            "block_utp_line2",
            "guarantee_type",
            "guarantees_crm",
            "content",
            "relink",
            "relink_name",
            "relink_blog",
            "amo",
            "individual_meta_data",
            "level_main",
            "level_list",
            "level_item",
            "pos"
          ]
        }
      },
      {
        "table": {
          "table_name": "cscart_category_descriptions",
          "access_type": "ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "category_id"
          ],
          "key_length": "3",
          "ref": [
            "const"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "0.25",
            "eval_cost": "0.10",
            "prefix_cost": "0.35",
            "data_read_per_join": "4K"
          },
          "used_columns": [
            "category_id",
            "lang_code",
            "category",
            "description",
            "meta_keywords",
            "meta_description",
            "page_title",
            "age_warning_message",
            "ab__fn_label_text",
            "ab__fn_label_show",
            "breadcrumbs",
            "robots",
            "products_count",
            "icon",
            "counts"
          ]
        }
      }
    ]
  }
}