Sandbox

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 (
    8819, 8453, 8632, 7831, 7167, 8027, 7694, 
    12087, 12088, 12089, 12090, 12084, 
    12085, 12086, 18675, 18680, 18610, 
    18611, 18612, 18633, 18553, 18491, 
    18492, 18493
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00027

JSON explain

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