Do I need to index incremental Ids mysql, MyISAM?

Question

MySQL

Table 6.5 *10^6 records 2.9 Gb
primary key `id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
Table only for most selects by ID.
Attention to the question: will there be a performance increase in such hands?

Answer 1

PRIMARY KEY is already an index of type UNIQUE