SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    298, 53, 103, 205, 341, 5475, 370, 69, 
    70, 219, 89, 398, 234
  )

Query time 0.00063

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": 13,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (298,53,103,205,341,5475,370,69,70,219,89,398,234)"
    }
  }
}