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 (
    245, 238, 239, 331, 335, 339, 341, 355, 
    356, 357, 358, 359, 360, 361, 362, 363
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "16.63"
    },
    "table": {
      "table_name": "cscart_product_review_prepared_data",
      "access_type": "ALL",
      "possible_keys": [
        "PRIMARY"
      ],
      "rows_examined_per_scan": 72,
      "rows_produced_per_join": 16,
      "filtered": "22.22",
      "cost_info": {
        "read_cost": "13.43",
        "eval_cost": "3.20",
        "prefix_cost": "16.63",
        "data_read_per_join": "256"
      },
      "used_columns": [
        "product_id",
        "storefront_id",
        "average_rating",
        "reviews_count"
      ],
      "attached_condition": "((`pankajecarter_systemfour`.`cscart_product_review_prepared_data`.`storefront_id` = 0) and (`pankajecarter_systemfour`.`cscart_product_review_prepared_data`.`product_id` in (245,238,239,331,335,339,341,355,356,357,358,359,360,361,362,363)))"
    }
  }
}