Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe3c0c495383f587684cd3947c5f7e29551f836a783950b84f938569c117ce39' 
  AND token = 'n4T5nZffJLVI4ypqvheO9GgF6iVxR2EqnTYW+2uDkq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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