SELECT 
  cscart_product_feature_variants.variant_id, 
  cscart_product_feature_variants.position, 
  cscart_product_feature_variants.color, 
  cscart_product_feature_variant_descriptions.variant 
FROM 
  cscart_product_feature_variants 
  LEFT JOIN cscart_product_feature_variant_descriptions ON cscart_product_feature_variants.variant_id = cscart_product_feature_variant_descriptions.variant_id 
  AND cscart_product_feature_variant_descriptions.lang_code = 'en' 
WHERE 
  cscart_product_feature_variants.variant_id IN (
    1288, 1935, 2378, 1712, 2416, 1954, 1836, 
    1660, 2402, 2407, 2424, 2422, 2428, 
    1659, 2182, 1389, 1904, 1900, 1899, 
    2290, 2439, 1202, 1912, 2556, 1905, 
    1789, 2499, 1787, 2557, 1881, 2333, 
    1988, 2359, 1941, 2000, 1995, 1867, 
    2354, 1748, 2075, 1973, 1972, 2340, 
    1902, 2355, 1931, 2353, 2558, 2451, 
    1462, 2560, 2561, 2562, 2417, 2538, 
    2537, 2539, 1797, 1690, 1861, 2412, 
    2432, 2442, 2455, 2457, 2461
  ) 
ORDER BY 
  cscart_product_feature_variants.position ASC, 
  cscart_product_feature_variant_descriptions.variant ASC

Query time 0.00138

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "69.31"
    },
    "ordering_operation": {
      "using_temporary_table": true,
      "using_filesort": true,
      "nested_loop": [
        {
          "table": {
            "table_name": "cscart_product_feature_variants",
            "access_type": "range",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "variant_id"
            ],
            "key_length": "3",
            "rows_examined_per_scan": 66,
            "rows_produced_per_join": 66,
            "filtered": "100.00",
            "index_condition": "(`test2_gaseus`.`cscart_product_feature_variants`.`variant_id` in (1288,1935,2378,1712,2416,1954,1836,1660,2402,2407,2424,2422,2428,1659,2182,1389,1904,1900,1899,2290,2439,1202,1912,2556,1905,1789,2499,1787,2557,1881,2333,1988,2359,1941,2000,1995,1867,2354,1748,2075,1973,1972,2340,1902,2355,1931,2353,2558,2451,1462,2560,2561,2562,2417,2538,2537,2539,1797,1690,1861,2412,2432,2442,2455,2457,2461))",
            "cost_info": {
              "read_cost": "39.61",
              "eval_cost": "6.60",
              "prefix_cost": "46.21",
              "data_read_per_join": "75K"
            },
            "used_columns": [
              "variant_id",
              "color",
              "position"
            ]
          }
        },
        {
          "table": {
            "table_name": "cscart_product_feature_variant_descriptions",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "variant_id",
              "lang_code"
            ],
            "key_length": "9",
            "ref": [
              "test2_gaseus.cscart_product_feature_variants.variant_id",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 66,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "16.50",
              "eval_cost": "6.60",
              "prefix_cost": "69.31",
              "data_read_per_join": "205K"
            },
            "used_columns": [
              "variant_id",
              "variant",
              "lang_code"
            ]
          }
        }
      ]
    }
  }
}