SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33ceb68889d7a5a4146fc37e9c94cf9f7e2abb8cb887244acbfdeff723f1db83' 
  AND token = 'VIzqvJGa2kUJUZrhFGqjImJhcv9UDHWi58DZB7cPGfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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