MariaDB [test]> EXPLAIN SELECT * FROM testtbl WHERE id_nam=0;
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+------+-------------+---------+------+---------------+------+---------+------+------+-------------+
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| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
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+------+-------------+---------+------+---------------+------+---------+------+------+-------------+
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| 1 | SIMPLE | testtbl | ALL | id_nam | NULL | NULL | NULL | 198 | Using where |
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+------+-------------+---------+------+---------------+------+---------+------+------+-------------+
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1 row in set (0.000 sec)
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1.txt
testtbl.sql