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 (
    371, 370, 369, 368, 367, 366, 365, 364, 
    363, 362, 361, 360, 359, 358, 357, 356, 
    355, 354, 353, 352, 351, 350, 349, 348, 
    347, 346, 345, 344, 342, 341, 340, 339, 
    338, 335, 334, 333, 332, 331, 330, 325, 
    324, 323, 322, 321, 320, 319, 318, 317, 
    316, 315, 314, 313, 312, 311, 310, 309, 
    308, 307, 306, 305, 304, 303, 302, 300, 
    298, 297, 296, 295, 294, 293, 292, 291
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00063

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_product_review_prepared_data",
          "access_type": "ALL",
          "possible_keys": ["PRIMARY"],
          "rows": 3,
          "filtered": 100,
          "attached_condition": "cscart_product_review_prepared_data.storefront_id = 0 and cscart_product_review_prepared_data.product_id in (371,370,369,368,367,366,365,364,363,362,361,360,359,358,357,356,355,354,353,352,351,350,349,348,347,346,345,344,342,341,340,339,338,335,334,333,332,331,330,325,324,323,322,321,320,319,318,317,316,315,314,313,312,311,310,309,308,307,306,305,304,303,302,300,298,297,296,295,294,293,292,291)"
        }
      }
    ]
  }
}

Result

product_id average_rating reviews_count
309 4.00 1