Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd842be73a55df768f56394a2a6201981a17880eda474b662243eccfae94794a9' 
  AND token = 'yd+tWEqIihCDfQbfzmpDufTivcgjHY8Coq21e+cLFZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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