Is it possible to decrypt a base 64 text with a key and AES standard?

I'm working with Python and the Pycryptodome library.
I have a string beginning with 951bd9...[and so on].
Let's suppose I have a key"ThisIsARandomText".

My question is : could I decrypt that string with an AES algorithm and that key ?

I think I don't get it all and I would be pleased to have some explanations to improve.
Thanks you very much for your help !

How many English words
do you know?
Test your English vocabulary size, and measure
how many words do you know
Online Test
Powered by Examplum