Simple flask authorization?

Question

MySQL

And hello again, I need to create a simple authorization for a small database project, in the last question I approximately created such an authorization, but now I want to ask you if I'm going the right way, or is it still worth using libraries that are calculated for this? But again, I need simplicity and optimization.
If there are any interesting libraries or examples, please throw them here, then I've already rummaged through the whole Google (maybe I didn't dug well, because I'm doing it in a hurry).