What are these queries for and how to disable them?

I have millions of queries without indexes, and wanted to know what are they doing and if it's possible to disable a function to stop them, these are some examples:

SELECT `phrase_key` FROM `wp_wc_phrases` WHERE `phrase_key` LIKE 'wc_be_the_first_text';
# Query_time: 0.000205  Lock_time: 0.000039 Rows_sent: 101  Rows_examined: 101
SET timestamp=1490659590;
SELECT `phrase_key`, `phrase_value` FROM `wp_wc_phrases`;
# Time: 170328  0:06:31
# Query_time: 0.000411  Lock_time: 0.000152 Rows_sent: 1  Rows_examined: 101
SET timestamp=1490659591;
SELECT `phrase_key` FROM `wp_wc_phrases` WHERE `phrase_key` LIKE 'wc_be_the_first_text';
# Query_time: 0.000162  Lock_time: 0.000038 Rows_sent: 101  Rows_examined: 101
SET timestamp=1490659591;
SELECT `phrase_key`, `phrase_value` FROM `wp_wc_phrases`;
# Query_time: 0.000558  Lock_time: 0.000198 Rows_sent: 0  Rows_examined: 0