Query FROM Indexed View queries underlying table in Execution plan
The optimizer might choose to use the underlying table (it "expands" the view) based on how it chooses to implement your query.  To force the query to use the indexed view, you could add a WITH (NOEXPAND) hint to the FROM clause of the query where the view is referenced.

This is useful for two reasons:


It gets the query to use the view you want
It might show you why the optimizer chose not to use the view (maybe the index definition needs to be tweaked to get better performance, etc)


By the way, it's recommended to use this hint regardless when referencing indexed views directly, in order to avoid other problematic behavior.  See this article from Paul White for details: Indexed Views and Statistics