index issues with generate_series.....or why this index os not working

Greetings!!

I'm not sure why the query is not using the gist index in the table
base.parishes. Any suggestions?
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CREATE TABLE base.parishes
(
gid serial NOT NULL,
parish text,
"COUNT" integer,
"SUM_AREA" double precision,
"SUM_ELECTO" double precision,
the_geom geometry,
CONSTRAINT parishes_pkey PRIMARY KEY (gid),
CONSTRAINT enforce_dims_the_geom CHECK (st_ndims(the_geom) = 2),
CONSTRAINT enforce_srid_the_geom CHECK (st_srid(the_geom) = 3448)
)
WITH (
OIDS=FALSE
);
ALTER TABLE base.parishes OWNER TO postgres;

-- Index: base.gfd7ir67uftyujrth7ji68t678jttyrdgd

-- DROP INDEX base.gfd7ir67uftyujrth7ji68t678jttyrdgd;

CREATE INDEX gfd7ir67uftyujrth7ji68t678jttyrdgd
ON base.parishes
USING gist
(the_geom);
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The query:
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with mnme as (
select generate_series(600000,840000,2) mn, generate_series(610000,710000,2)me
),
points as
(select st_makepoint(mn,me), parish from mnme inner join
base.parishes on
st_intersects(setsrid(st_makepoint(mn,me),3448),the_geom))

select * from points
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