There is no such a thing as instant exchange, you could try circle/ coinmama/ cex.io, but don't expect to get your coins in a minute, not to mention registering process KYC and verifying your identity.
For altcoin to bitcoin the best and fastest is "shapeshift".
I clearly didn't mean it that way , I have no problem using a service If takes a couple of minutes as for KYC and verifying my identity then It's something that I'm not going to do , call me paranoid but I don't feel good sending my documents to random website even If they are legit and licensed.