SELECT 
  cscart_product_reviews.*, 
  cscart_users.company_id as reply_company_id, 
  cscart_companies.company as reply_company, 
  cscart_country_descriptions.country as country 
FROM 
  cscart_product_reviews 
  LEFT JOIN cscart_users ON cscart_product_reviews.reply_user_id = cscart_users.user_id 
  LEFT JOIN cscart_companies ON cscart_users.company_id = cscart_companies.company_id 
  LEFT JOIN cscart_country_descriptions ON cscart_product_reviews.country_code = cscart_country_descriptions.code 
  AND cscart_country_descriptions.lang_code = 'en' 
WHERE 
  1 
  AND cscart_product_reviews.product_id IN (172) 
  AND cscart_product_reviews.status = 'A' 
GROUP BY 
  cscart_product_reviews.product_review_id 
ORDER BY 
  cscart_product_reviews.product_review_timestamp desc 
LIMIT 
  0, 10

Query time 0.00078

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "1.56"
    },
    "ordering_operation": {
      "using_filesort": true,
      "grouping_operation": {
        "using_temporary_table": true,
        "using_filesort": false,
        "nested_loop": [
          {
            "table": {
              "table_name": "cscart_product_reviews",
              "access_type": "ref",
              "possible_keys": [
                "PRIMARY",
                "idx_product_id"
              ],
              "key": "idx_product_id",
              "used_key_parts": [
                "product_id"
              ],
              "key_length": "3",
              "ref": [
                "const"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "10.00",
              "index_condition": "(`danishecarter_may_2024`.`cscart_product_reviews`.`product_id` <=> 172)",
              "cost_info": {
                "read_cost": "1.00",
                "eval_cost": "0.02",
                "prefix_cost": "1.20",
                "data_read_per_join": "166"
              },
              "used_columns": [
                "product_review_id",
                "product_id",
                "user_id",
                "name",
                "advantages",
                "disadvantages",
                "comment",
                "rating_value",
                "ip_address",
                "is_buyer",
                "product_review_timestamp",
                "country_code",
                "city",
                "reply_user_id",
                "reply",
                "reply_timestamp",
                "helpfulness",
                "status",
                "storefront_id"
              ],
              "attached_condition": "(`danishecarter_may_2024`.`cscart_product_reviews`.`status` = 'A')"
            }
          },
          {
            "table": {
              "table_name": "cscart_users",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "user_id"
              ],
              "key_length": "3",
              "ref": [
                "danishecarter_may_2024.cscart_product_reviews.reply_user_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.10",
                "eval_cost": "0.02",
                "prefix_cost": "1.32",
                "data_read_per_join": "657"
              },
              "used_columns": [
                "user_id",
                "company_id"
              ]
            }
          },
          {
            "table": {
              "table_name": "cscart_companies",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "company_id"
              ],
              "key_length": "4",
              "ref": [
                "danishecarter_may_2024.cscart_users.company_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.10",
                "eval_cost": "0.02",
                "prefix_cost": "1.44",
                "data_read_per_join": "644"
              },
              "used_columns": [
                "company_id",
                "company"
              ]
            }
          },
          {
            "table": {
              "table_name": "cscart_country_descriptions",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "code",
                "lang_code"
              ],
              "key_length": "12",
              "ref": [
                "danishecarter_may_2024.cscart_product_reviews.country_code",
                "const"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.10",
                "eval_cost": "0.02",
                "prefix_cost": "1.56",
                "data_read_per_join": "40"
              },
              "used_columns": [
                "code",
                "lang_code",
                "country"
              ]
            }
          }
        ]
      }
    }
  }
}