Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c6affa5e48827d060b18a79dc16fc392f38c45af0b5b5305ccadebeea98c138' 
  AND token = 'oouY4tetL0BziNQBCyBZtcW8DoKwHrDhBLfpgf6sWAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}