Redirect without URL parameters

I want to redirect this kind of URL:
https://www.tecnomaquinaria.com/productos.php?cat=4

to a WooCommerce product:
https://www.tecnomaquinaria.com/producto/torno-hurco-tm12i/

but I am getting the ?cat=4 at the end of the URL:
https://www.tecnomaquinaria.com/producto/torno-hurco-tm12i/?cat=4

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A related problem is this one:

When I try to redirect:
https://www.tecnomaquinaria.com/productos.php?cat=12&mod=69

to a product category:
https://www.tecnomaquinaria.com/categoria/maquinaria-convencional/tornos/

It takes me to https://www.tecnomaquinaria.com/categoria/maquinaria-convencional/tornos/?cat=12&mod=69 causing a 404 error.

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