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 (
    187, 319, 321, 322, 323, 324, 325, 326, 
    327, 328, 329, 330, 331, 332, 333, 334
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "12.56"
    },
    "table": {
      "table_name": "cscart_product_review_prepared_data",
      "access_type": "ALL",
      "possible_keys": [
        "PRIMARY"
      ],
      "rows_examined_per_scan": 52,
      "rows_produced_per_join": 15,
      "filtered": "30.77",
      "cost_info": {
        "read_cost": "9.37",
        "eval_cost": "3.20",
        "prefix_cost": "12.57",
        "data_read_per_join": "255"
      },
      "used_columns": [
        "product_id",
        "storefront_id",
        "average_rating",
        "reviews_count"
      ],
      "attached_condition": "((`atulecarter_atul_demo2`.`cscart_product_review_prepared_data`.`storefront_id` = 0) and (`atulecarter_atul_demo2`.`cscart_product_review_prepared_data`.`product_id` in (187,319,321,322,323,324,325,326,327,328,329,330,331,332,333,334)))"
    }
  }
}