Sandbox

SELECT 
  1 
FROM 
  cscart_aprilec_print_temp_designs 
WHERE 
  session_id = '8BE4-ZE10-XC3C-M2H1-25E3-Z2KR-8F9D-9Y6I' 
  AND product_id = 139 
  AND expires_at > 1778067620 
  AND confirmed = 'Y' 
LIMIT 
  1

Query time 0.00037

JSON explain

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