Sandbox

SELECT 
  1 
FROM 
  cscart_aprilec_print_temp_designs 
WHERE 
  session_id = 'IAG8-VMCC-5A8E-SK4A-WI44-BLTW-DUBW-Z6BS' 
  AND product_id = 140 
  AND expires_at > 1778098129 
  AND confirmed = 'Y' 
LIMIT 
  1

Query time 0.00023

JSON explain

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