https://preprod.theatre-contemporain.net/spectacles/Miranda-et-le-trou-noir/?path=spectacles%2FMiranda-et-le-trou-noir%2F

id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE j3 const PRIMARY PRIMARY 4 const 1 Using index
1 SIMPLE j2 ref PRIMARY, idclassification PRIMARY 4 const 1 Using index
1 SIMPLE j1 eq_ref PRIMARY PRIMARY 4 theatreok_dev.j2.idclassification 1