This doesn’t seem possible. However, if you only have 1 product and have no plan to add other products / want to focus on this product even in future; I believe it is possible to customize homepage, so it looks like a product page completed with add to cart and other related functionality.
Topic summary
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Issue: A store owner using a script to redirect from the homepage to a single product page sees a brief flash of the homepage before redirect, which appears unprofessional.
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Goal: Achieve an instantaneous redirect so customers never perceive the homepage, given the store sells only one product.
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Response: A contributor states this is not feasible to fully eliminate the initial homepage render.
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Suggested workaround: If the store will remain single-product, customize the homepage to function as the product page itself (including add-to-cart and related product-page features), avoiding the need for a redirect.
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Outcome: No technical solution or code shared to enable a truly seamless redirect; the recommendation is a design change rather than a redirect.
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Status: Unresolved regarding instant redirect; practical resolution is to convert the homepage into a product-like page.