Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f43c0a4e72c2b100bd4df98c23b288401e8233a490d12add11881a9ec1cce2' 
  AND token = 'VsbrNokwtLGLtO4+ghh9YmDf9QaFZpTZTw98Qzd7u3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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