Do you want to change the look of the leather and wood? You can use chalk paint right over both if so. Here's an article related to that very thing. https://www.thepurplepaintedlady.com/tag/chalk-paint-on-leather/
Refinish back to what it was or paint?
If you are wanting to paint the entire end table, like Molly said a chalk based paint or mineral paint will go over both surfaces! :)
I have used leather restorer product on our sofa which has an amzing result on the leather, you could then refresh the wood (I am based in the UK so wont link the product!!)