buy bitcoins – How to convert my euro to BTC the fastest

consider me a crypto noob.

All I want is to transfer it ~ 10 euro (resides in my Prepaid Mastercard) to a BTC address (I have one, in my blockchain Account).
Then I have to give these BTCs to a service that requested this (like 0,001); they also provided me with a QR Code.

What is the fastest (like, right now) way you can think of to pay my service?

PS. I just got checked on blockchain (and I became Gold member), however when I try to deposit EUR / USD (in Exchange), it just shows me some bank details (recipient, where to send, etc.), no paypal or anything else. I guess it will take time for the money transfer.

Thanks for the help