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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 (
    12, 78, 79, 11, 41, 81, 107, 109, 91, 92, 
    34, 15, 31, 38, 80, 102, 28, 280, 282, 
    278, 7, 27
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_review_prepared_data",
      "access_type": "ALL",
      "possible_keys": ["PRIMARY"],
      "rows": 52,
      "filtered": 42.30769348,
      "attached_condition": "cscart_product_review_prepared_data.storefront_id = 0 and cscart_product_review_prepared_data.product_id in (12,78,79,11,41,81,107,109,91,92,34,15,31,38,80,102,28,280,282,278,7,27)"
    }
  }
}

Result

product_id	average_rating	reviews_count
78	4.00	1
280	5.00	1
282	3.50	2