SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd42e12db05b43332ab6b1336b59a21554a43fa9b588be8dee1d796b164f3f360' 
  AND token = 'rzP9xHTvGlFOAkJOXgdoxK81tAXdgzo6ZBn/n7mKBJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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