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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 (
    19485, 19486, 19487, 19488, 19489, 19490, 
    19491, 19492, 19493, 19494, 19495, 
    19496, 19497, 19498, 19499, 19500
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00900

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_review_prepared_data",
      "access_type": "ALL",
      "possible_keys": ["PRIMARY"],
      "rows": 5,
      "filtered": 100,
      "attached_condition": "cscart_product_review_prepared_data.storefront_id = 0 and cscart_product_review_prepared_data.product_id in (19485,19486,19487,19488,19489,19490,19491,19492,19493,19494,19495,19496,19497,19498,19499,19500)"
    }
  }
}