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 (
    1202, 1973, 1904, 1659, 1660, 2540, 1905, 
    1789, 2499, 1787, 1900, 1899, 2542, 
    2543, 2544, 2545, 2546, 2547, 2548, 
    2550, 2551, 2552, 2553, 2554, 2555, 
    2470, 2000, 2451, 2455, 1462, 2457, 
    1972, 1902, 2075, 1995, 2483, 2484, 
    2491, 2494, 2495, 1389, 2355, 2496, 
    2500, 2502, 2505, 2506, 2507, 2509, 
    2510, 2512, 2514, 2516, 2520, 2523, 
    2525, 2526, 2527, 2528, 2529, 2530, 
    2531, 2532, 2533, 2534, 2535, 1931, 
    1912, 2366, 2367, 1748, 1935, 1712, 
    2353, 2361, 2363, 1988, 2357, 1941, 
    2365, 2335, 2360, 2358, 1984, 2290, 
    1996, 2340, 1930, 2354, 1867, 1545, 
    2268, 1994, 2333, 2566, 2567, 1836, 
    1881
  ) 
ORDER BY 
  cscart_product_feature_variants.position ASC, 
  cscart_product_feature_variant_descriptions.variant ASC

Query time 0.00123

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "102.91"
    },
    "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": 98,
            "rows_produced_per_join": 98,
            "filtered": "100.00",
            "index_condition": "(`test2_gaseus`.`cscart_product_feature_variants`.`variant_id` in (1202,1973,1904,1659,1660,2540,1905,1789,2499,1787,1900,1899,2542,2543,2544,2545,2546,2547,2548,2550,2551,2552,2553,2554,2555,2470,2000,2451,2455,1462,2457,1972,1902,2075,1995,2483,2484,2491,2494,2495,1389,2355,2496,2500,2502,2505,2506,2507,2509,2510,2512,2514,2516,2520,2523,2525,2526,2527,2528,2529,2530,2531,2532,2533,2534,2535,1931,1912,2366,2367,1748,1935,1712,2353,2361,2363,1988,2357,1941,2365,2335,2360,2358,1984,2290,1996,2340,1930,2354,1867,1545,2268,1994,2333,2566,2567,1836,1881))",
            "cost_info": {
              "read_cost": "58.81",
              "eval_cost": "9.80",
              "prefix_cost": "68.61",
              "data_read_per_join": "111K"
            },
            "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": 98,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "24.50",
              "eval_cost": "9.80",
              "prefix_cost": "102.91",
              "data_read_per_join": "305K"
            },
            "used_columns": [
              "variant_id",
              "variant",
              "lang_code"
            ]
          }
        }
      ]
    }
  }
}