SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1a629605f29c10ddf2e28e2f41f3ab3b569b4edaa98f3903c5342ede46142d' 
  AND token = '9M2JvFHmqKFCubYJw/jRX3taBgxEOxrafWQegIUHK7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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