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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 (
    50982, 133, 45, 143, 50983, 51416, 51043, 
    51471, 51421, 51413, 51547, 51057, 
    51472, 51470, 51500, 51412
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 1

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "Impossible WHERE noticed after reading const tables"
  }
}