Sandbox

SELECT 
  1 
FROM 
  cscart_aprilec_print_temp_designs 
WHERE 
  session_id = '4ZV8-VKXQ-D6OO-SMGS-GQ1W-74LL-WN9P-PKNN' 
  AND product_id = 241 
  AND expires_at > 1777128595 
  AND confirmed = 'Y' 
LIMIT 
  1

Query time 0.00048

JSON explain

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