SELECT 
  pfv.variant_id, 
  pfv.position, 
  pfvd.variant 
FROM 
  cscart_product_feature_variants AS pfv 
  INNER JOIN cscart_product_feature_variant_descriptions AS pfvd ON pfv.variant_id = pfvd.variant_id 
  AND pfvd.lang_code = 'vi' 
WHERE 
  pfv.variant_id IN (
    71092, 71091, 71090, 71089, 71088, 71087, 
    71086, 71093, 71100, 71099, 71098, 
    71097, 71096, 71095, 71094, 71101, 
    71116, 71115, 71114, 71113, 71112, 
    71111, 71110, 71117, 71124, 71123, 
    71122, 71121, 71120, 71119, 71118, 
    71125, 71132, 71131, 71130, 71129, 
    71128, 71127, 71126, 71133, 77111, 
    77110, 81601, 81610, 81611, 81612, 
    81613, 81614, 81615, 81616, 81617, 
    81602, 81603, 81604, 81605, 81606, 
    81607, 81608, 81609, 81619, 81620, 
    81621, 81622, 81623, 81624, 81625, 
    81626, 81627, 81628, 83869, 83870, 
    84318, 84319, 84320, 84321, 84473, 
    84474, 86729, 86725, 86731, 86728, 
    86730, 86727, 86726
  )

Query time 0.00528

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "pfv",
          "access_type": "range",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["variant_id"],
          "rows": 84,
          "filtered": 100,
          "index_condition": "pfv.variant_id in (71092,71091,71090,71089,71088,71087,71086,71093,71100,71099,71098,71097,71096,71095,71094,71101,71116,71115,71114,71113,71112,71111,71110,71117,71124,71123,71122,71121,71120,71119,71118,71125,71132,71131,71130,71129,71128,71127,71126,71133,77111,77110,81601,81610,81611,81612,81613,81614,81615,81616,81617,81602,81603,81604,81605,81606,81607,81608,81609,81619,81620,81621,81622,81623,81624,81625,81626,81627,81628,83869,83870,84318,84319,84320,84321,84473,84474,86729,86725,86731,86728,86730,86727,86726)"
        }
      },
      {
        "table": {
          "table_name": "pfvd",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "9",
          "used_key_parts": ["variant_id", "lang_code"],
          "ref": ["dev_db.pfv.variant_id", "const"],
          "rows": 1,
          "filtered": 100,
          "index_condition": "pfvd.lang_code = 'vi'"
        }
      }
    ]
  }
}