Would it be harmless to insert indexes to wp_posts manually?

I observe in my gradual question log I have numerous calls like so: Select article_date_gmt FROM wp_posts Where submit_position = ‘publish’ AND article_kind IN (‘post’, ‘page’, ‘attachment’, ‘qwerty’, ‘xyz’, ‘abc’) Order BY article_day_gmt DESC Limit 1 and Pick out publish_modified_gmt FROM wp_posts In which write-up_status = ‘publish’ AND article_sort IN (‘post’, ‘page’, ‘attachment’, ‘qwerty’, ‘xyz’, …

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