SELECT 
  f.feature_id, 
  f.purpose, 
  p.product_id, 
  p.parent_product_id, 
  g.id, 
  g.code 
FROM 
  cscart_product_variation_group_features AS f 
  INNER JOIN cscart_product_variation_groups AS g ON f.group_id = g.id 
  INNER JOIN cscart_product_variation_group_products AS p ON f.group_id = p.group_id 
WHERE 
  p.product_id IN (
    96121, 96494, 96495, 96496, 96497, 96498, 
    96499, 96500, 96501, 96502, 96503, 
    96504, 96505, 96506, 96507, 96508, 
    96509, 96530, 96570, 96571, 96572, 
    96573, 97574, 97575, 97581, 97608, 
    97609, 97610, 97611, 97612, 97613, 
    97614, 97615, 97616, 97617, 97618, 
    97619, 97620, 97621, 97622, 97623, 
    97624, 97625, 97626, 97627, 97629, 
    97630, 97631, 97632, 97633, 97634, 
    97635, 97636, 97637, 97638, 97639, 
    97640, 97641, 97642, 97643, 97644, 
    97645, 97646, 97647, 97648, 97649, 
    97650, 97651, 97652, 97653, 97654, 
    97655, 97656, 97657, 97658, 97659, 
    97660, 97661, 97662, 97663, 97664, 
    97665, 97666, 97667, 97668, 97669, 
    97670, 97671, 97672, 97673, 97674, 
    97675, 97676, 97677, 97678, 97679
  )

Query time 0.00081

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "1.05"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "f",
          "access_type": "ALL",
          "possible_keys": [
            "idx_group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "0.25",
            "eval_cost": "0.10",
            "prefix_cost": "0.35",
            "data_read_per_join": "104"
          },
          "used_columns": [
            "feature_id",
            "purpose",
            "group_id"
          ]
        }
      },
      {
        "table": {
          "table_name": "g",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "id"
          ],
          "key_length": "3",
          "ref": [
            "nuie_scalesta_net.f.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "0.25",
            "eval_cost": "0.10",
            "prefix_cost": "0.70",
            "data_read_per_join": "400"
          },
          "used_columns": [
            "id",
            "code"
          ]
        }
      },
      {
        "table": {
          "table_name": "p",
          "access_type": "ref",
          "possible_keys": [
            "PRIMARY",
            "idx_group_id"
          ],
          "key": "idx_group_id",
          "used_key_parts": [
            "group_id"
          ],
          "key_length": "3",
          "ref": [
            "nuie_scalesta_net.f.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "index_condition": "(`nuie_scalesta_net`.`p`.`product_id` in (96121,96494,96495,96496,96497,96498,96499,96500,96501,96502,96503,96504,96505,96506,96507,96508,96509,96530,96570,96571,96572,96573,97574,97575,97581,97608,97609,97610,97611,97612,97613,97614,97615,97616,97617,97618,97619,97620,97621,97622,97623,97624,97625,97626,97627,97629,97630,97631,97632,97633,97634,97635,97636,97637,97638,97639,97640,97641,97642,97643,97644,97645,97646,97647,97648,97649,97650,97651,97652,97653,97654,97655,97656,97657,97658,97659,97660,97661,97662,97663,97664,97665,97666,97667,97668,97669,97670,97671,97672,97673,97674,97675,97676,97677,97678,97679))",
          "cost_info": {
            "read_cost": "0.25",
            "eval_cost": "0.10",
            "prefix_cost": "1.05",
            "data_read_per_join": "16"
          },
          "used_columns": [
            "product_id",
            "parent_product_id",
            "group_id"
          ]
        }
      }
    ]
  }
}