Yes, it's immediately usable. CVC verifies you, not the transaction - websites ask for it not because they need it, but to see if you get it right. So, lacking

Yes, it's immediately usable. CVC verifies you, not the transaction - websites ask for it not because they need it, but to see if you get it right. So, lacking the CVC may cause some cautious companies to refuse to take the card, but that's just their decision. You can still use it with less-cautious companies, or your own merchant account.