SELECT 
  cscart_products.*, 
  cscart_products.ebay_status, 
  cscart_products.ebay_template_id 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    19709, 19710, 19711, 19712, 19713, 19714, 
    19715, 19716, 19717, 19718, 19719, 
    19720, 19721, 19722, 19723, 19724
  )

Query time 0.00040

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 (19709,19710,19711,19712,19713,19714,19715,19716,19717,19718,19719,19720,19721,19722,19723,19724)"
    }
  }
}