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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aafce92c54c902c6439210221d440a4563425b73c231c65d13558ad1525dcde4' 
  AND token = 'ILRA9fOE1647L0yf8laS77d4l7jrv8E+ddiDhngy/oE=' 
  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"
    }
  }
}