1. Customers can buy this product at shops at the airport.
2. You can ask any doctors about your health problems.
I want "any" to mean "no matter which".
Sentence (1) does not contain "any." I would use the singular with "any":
1a. Customers can buy this product at any shop at the airport.
And I'd also use the singular in sentence (2):
2a. You can ask any doctor about your health problems.
The use of "any" with a plural noun in the affirmative is not so usual because, as I said in my first reply, there must be some need to express plurality for the plural noun to be justified, and in the sentences above each customer will go to one shop, no matter which shop, to buy the product, and each patient will resort to one doctor, no matter which doctor, to consult about their health problems.
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