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 (
    72988, 72987, 72986, 72985, 72984, 72983, 
    72982, 72981, 72980, 72989, 73000, 
    73001, 73005, 73004, 73003, 73002, 
    73006, 74646, 74647, 74648, 74650, 
    74649, 74651, 74657, 74656, 74655, 
    74654, 74653, 74652, 74671, 74670, 
    74669, 74668, 74667, 74666, 74665, 
    74664, 74685, 74684, 74683, 74682, 
    74681, 74686, 74688, 74687, 85392, 
    85393, 85635, 85629, 85634, 85626, 
    85636, 85627, 85628, 85633, 85632, 
    85631, 85630, 85738, 85746, 85747, 
    85748, 85739, 85740, 85741, 85742, 
    85743, 85744, 85745, 85749, 85757, 
    85758, 85759, 85750, 85751, 85752, 
    85753, 85754, 85755, 85756, 86716, 
    86717, 86718, 86719, 86720, 86721, 
    86722, 86723, 86724
  )

Query time 0.01477

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": 89,
          "filtered": 100,
          "index_condition": "pfv.variant_id in (72988,72987,72986,72985,72984,72983,72982,72981,72980,72989,73000,73001,73005,73004,73003,73002,73006,74646,74647,74648,74650,74649,74651,74657,74656,74655,74654,74653,74652,74671,74670,74669,74668,74667,74666,74665,74664,74685,74684,74683,74682,74681,74686,74688,74687,85392,85393,85635,85629,85634,85626,85636,85627,85628,85633,85632,85631,85630,85738,85746,85747,85748,85739,85740,85741,85742,85743,85744,85745,85749,85757,85758,85759,85750,85751,85752,85753,85754,85755,85756,86716,86717,86718,86719,86720,86721,86722,86723,86724)"
        }
      },
      {
        "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'"
        }
      }
    ]
  }
}