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 (
    312419, 391002, 390979, 390978, 391013, 
    391014, 390986, 112217, 391009, 400923, 
    391023, 312417, 312421, 390994, 312426, 
    312427, 312428, 312429, 312430, 312431, 
    312432, 312433, 461018, 390974, 391026, 
    391008, 393787, 400916, 312423, 390980, 
    400921, 400925, 400922, 400924, 312420, 
    460961, 390977, 390984, 390981, 391005, 
    391003, 390987, 391006, 391004, 391007, 
    391028, 460952, 391015, 391021, 312434, 
    400915, 400918, 15, 391024, 400919, 
    390991, 390990, 390992, 390975, 391011, 
    391010, 391025, 390985, 390996, 390997, 
    391012, 400920, 391000, 391001, 391020, 
    461008, 390993, 390989, 390988, 390999, 
    390998, 278, 390982, 390983, 400917, 
    390995, 400914, 391022, 312422
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.0198198,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_product_review_prepared_data",
          "access_type": "ALL",
          "possible_keys": ["PRIMARY"],
          "loops": 1,
          "rows": 55,
          "cost": 0.0198198,
          "filtered": 100,
          "attached_condition": "cscart_product_review_prepared_data.storefront_id = 0 and cscart_product_review_prepared_data.product_id in (312419,391002,390979,390978,391013,391014,390986,112217,391009,400923,391023,312417,312421,390994,312426,312427,312428,312429,312430,312431,312432,312433,461018,390974,391026,391008,393787,400916,312423,390980,400921,400925,400922,400924,312420,460961,390977,390984,390981,391005,391003,390987,391006,391004,391007,391028,460952,391015,391021,312434,400915,400918,15,391024,400919,390991,390990,390992,390975,391011,391010,391025,390985,390996,390997,391012,400920,391000,391001,391020,461008,390993,390989,390988,390999,390998,278,390982,390983,400917,390995,400914,391022,312422)"
        }
      }
    ]
  }
}

Result

product_id average_rating reviews_count
15 4.00 1
390993 5.00 1