SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    12965, 12961, 12963, 12968, 12967, 12969, 
    17761, 17762, 17763, 17764, 17765, 
    17766, 17767, 17768, 17769, 17770, 
    17771, 12970, 12972, 12973
  )

Query time 0.00058

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_products",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["product_id"],
      "rows": 20,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (12965,12961,12963,12968,12967,12969,17761,17762,17763,17764,17765,17766,17767,17768,17769,17770,17771,12970,12972,12973)"
    }
  }
}