Check for shape key, which deforms something actually

From the internet I downloaded a high poly model which a ton of shape-keys.
As it turns out, some (most?) of them are initially created but do not deform the mesh.
Checking this by hand is a very tedious thing, since sitting the value of the shape key to one
and waiting, whether something happens takes…time (high poly mesh and
underpowered PC).

Is there any way to check the data connected with the shape keys via Python, whether
they will deform anything or not?

Cheers!
mcc