Sandbox

SELECT 
  1 
FROM 
  cscart_aprilec_print_temp_designs 
WHERE 
  session_id = '6FPI-2J11-RG8X-W8B1-VU16-NUA6-HDP3-7MVY' 
  AND product_id = 35 
  AND expires_at > 1777398919 
  AND confirmed = 'Y' 
LIMIT 
  1

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}