SELECT 
  cscart_products.*, 
  cscart_products.ebay_status, 
  cscart_products.ebay_template_id 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    19725, 19726, 19727, 19728, 19729, 19730, 
    19731, 19732, 19733, 19734, 19735, 
    19736, 19737, 19738, 19739, 19740
  )

Query time 0.00048

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": 16,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (19725,19726,19727,19728,19729,19730,19731,19732,19733,19734,19735,19736,19737,19738,19739,19740)"
    }
  }
}