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It is possible to some extent, just you would have to play some tricks. Such as when the selection tool is picked. You can either set a timer to check for selection, filter out the mouse release event, or do your own selection overlay.

A simpler way though is that a selection mask is created when you do a selection. So monitor the layer list events and when you see a selection mask being created, you know there is a selection

Edit: Simple example:

from krita import *
from PyQt5 import QtWidgets

qwin = Krita.instance().activeWindow().qwindow()
layerBox = qwin.findChild(QtWidgets.QDockWidget, "KisLayerBox")
layerList = layerBox.findChild(QtWidgets.QTreeView,"listLayers")

def layerChange():
    doc = Krita.instance().activeDocument()
    if doc.selection() is not None:
        print ("SELECTION!")
    else:
        print ("NO SELECTION")


layerList.model().sourceModel().dataChanged.connect(layerChange)
layerList.model().sourceModel().modelReset.connect(layerChange)
layerList.model().sourceModel().rowsRemoved.connect(layerChange)
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