SELECT 
  cscart_products.*, 
  cscart_products.ebay_status, 
  cscart_products.ebay_template_id 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    19517, 19518, 19519, 19520, 19521, 19522, 
    19523, 19524, 19525, 19526, 19527, 
    19528, 19529, 19530, 19531, 19532
  )

Query time 0.00033

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 (19517,19518,19519,19520,19521,19522,19523,19524,19525,19526,19527,19528,19529,19530,19531,19532)"
    }
  }
}