SELECT 
  cscart_products.*, 
  cscart_products.ebay_status, 
  cscart_products.ebay_template_id 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    23279, 23280, 23281, 23282, 23283, 23284, 
    23285, 23286, 23287, 23288, 23289, 
    23290, 23291, 23292, 23293, 23294
  )

Query time 0.00031

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 (23279,23280,23281,23282,23283,23284,23285,23286,23287,23288,23289,23290,23291,23292,23293,23294)"
    }
  }
}