index not used

Hi folks,

I'm doing a simple lookup in a small table by an unique id, and I'm
wondering, why explains tells me seqscan is used instead the key.

The table looks like:

id bigint primary key,
a varchar,
b varchar,
c varchar

and I'm quering: select * from foo where id = 2;

I've got only 15 records in this table, but I wanna have it as
fast as possible since its used (as a map between IDs and names)
for larger queries.

thx
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