SELECT 
  cscart_product_review_prepared_data.product_id AS product_id, 
  cscart_product_review_prepared_data.average_rating AS average_rating, 
  cscart_product_review_prepared_data.reviews_count AS reviews_count 
FROM 
  cscart_product_review_prepared_data 
WHERE 
  cscart_product_review_prepared_data.product_id IN (
    6521, 6508, 6419, 6519, 6420, 6517, 6458, 
    6597, 6565, 6566, 6570, 6599, 6568, 
    6596, 6598, 6595, 6273, 6265, 6329, 
    6357, 6350, 6348, 6285, 6322, 6284, 
    6327, 6283, 6326, 6363, 6351, 6324, 
    6409, 6325, 6349, 6863, 6328, 6352, 
    6353, 6410, 6418
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00072

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "1.00"
    },
    "table": {
      "table_name": "cscart_product_review_prepared_data",
      "access_type": "ALL",
      "possible_keys": [
        "PRIMARY"
      ],
      "rows_examined_per_scan": 5,
      "rows_produced_per_join": 5,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "0.50",
        "eval_cost": "0.50",
        "prefix_cost": "1.00",
        "data_read_per_join": "80"
      },
      "used_columns": [
        "product_id",
        "storefront_id",
        "average_rating",
        "reviews_count"
      ],
      "attached_condition": "((`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_review_prepared_data`.`storefront_id` = 0) and (`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_review_prepared_data`.`product_id` in (6521,6508,6419,6519,6420,6517,6458,6597,6565,6566,6570,6599,6568,6596,6598,6595,6273,6265,6329,6357,6350,6348,6285,6322,6284,6327,6283,6326,6363,6351,6324,6409,6325,6349,6863,6328,6352,6353,6410,6418)))"
    }
  }
}