How to optimize a mysql query - mysql

Question

I have a problem with a mysql query that sometimes needs more than 80 secs to execute.
Could you please help me to optimize it?
Here my sql code
SELECT
codFinAtl,
nome,
cognome,
dataNascita AS annoNascita,
MIN(tempoRisultato) AS tempoRisultato
FROM
graduatorie
INNER JOIN anagrafica ON codFin = codFinAtl
INNER JOIN manifestazionigrad ON manifestazionigrad.codice = graduatorie.codMan
WHERE
anagrafica.eliminato = 'n'
AND graduatorie.eliminato = 'n'
AND codGara IN('01', '81')
AND sesso = 'F'
AND manifestazionigrad.aa = '2018/19'
AND graduatorie.baseVasca = '25'
AND tempoRisultato IS NOT NULL
AND dataNascita BETWEEN '20050101' AND '20061231'
GROUP BY
codFinAtl
ORDER BY
tempoRisultato,
cognome,
nome
And my db schema
[UPDATE]
Here there is the results of EXPLAIN query
+----+-------------+--------------------+------------+--------+--------------------------+-----------+---------+-------------------------------+--------+----------+----------------------------------------------+
| id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
+----+-------------+--------------------+------------+--------+--------------------------+-----------+---------+-------------------------------+--------+----------+----------------------------------------------+
| 1 | SIMPLE | anagrafica | NULL | ALL | codFin | NULL | NULL | NULL | 334094 | 0.11 | Using where; Using temporary; Using filesort |
| 1 | SIMPLE | graduatorie | NULL | ref | codMan,codFinAtl,codGara | codFinAtl | 33 | finsicilia.anagrafica.codFin | 20 | 0.24 | Using where |
| 1 | SIMPLE | manifestazionigrad | NULL | eq_ref | codice | codice | 32 | finsicilia.graduatorie.codMan | 1 | 10.00 | Using index condition; Using where |
+----+-------------+--------------------+------------+--------+--------------------------+-----------+---------+-------------------------------+--------+----------+----------------------------------------------+

Answer 1

graduatorie: INDEX(eliminato, baseVasca)
manifestazionigrad: INDEX(aa, codMan)
These may not be sufficient. Please qualify each column in the query so we know which table they come from.
But the real problem is probably "explode-implode". First it explodes by JOINing, then it implodes by GROUP BY.
Is it possible to compute MIN(tempoRisultato) without any JOINs? (I can't even tell which table is involved.) If so, provide that, then we can discuss what to do next. There may be two choices: a derived table with the MIN, or a subquery in the JOIN that may be correlated or uncorrelated.
(tempoRisultato seems to be in two tables!)