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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 (
    19693, 19694, 19695, 19696, 19697, 19698, 
    19699, 19700, 19701, 19702, 19703, 
    19704, 19705, 19706, 19707, 19708
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00013

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 (19693,19694,19695,19696,19697,19698,19699,19700,19701,19702,19703,19704,19705,19706,19707,19708)"
    }
  }
}