SELECT 
  * 
FROM 
  cscart_product_feature_variants 
WHERE 
  variant_id IN (
    4793, 4775, 4786, 4772, 4765, 4764, 4790, 
    3953, 4791, 4792, 4778, 4766, 4807, 
    4763, 4783, 3745, 3719, 1938, 3709, 
    4754, 4862, 2886, 1934, 4753, 1913, 
    2162, 2375, 4867, 1895, 1858, 1862, 
    1882, 2398, 1878, 2970, 1909, 1941, 
    1880, 1910, 1869, 3096, 3084, 3099, 
    3103, 3098, 4981, 5074, 5138, 4983, 
    3093, 4980, 4979, 3102, 3101, 3092, 
    4917, 4913, 3085, 5029, 3090, 4922, 
    5063, 5139, 5019, 3086, 3087, 3686, 
    3089, 4880, 4974, 3104, 5034, 3091, 
    3088, 3097, 3094, 3095, 5008, 3100, 
    2982, 431, 2989, 3619, 3074, 3700, 3049, 
    3694, 2030, 1942, 1856, 1870, 1859, 
    0, 94, 93, 3047, 3073, 3072, 2992, 1931, 
    3606, 1860, 3623, 1959, 1979, 1881, 
    1897, 2399, 2567, 2928, 1899, 1898, 
    1952
  )

Query time 0.00099

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_product_feature_variants",
          "access_type": "range",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["variant_id"],
          "rows": 113,
          "filtered": 100,
          "index_condition": "cscart_product_feature_variants.variant_id in (4793,4775,4786,4772,4765,4764,4790,3953,4791,4792,4778,4766,4807,4763,4783,3745,3719,1938,3709,4754,4862,2886,1934,4753,1913,2162,2375,4867,1895,1858,1862,1882,2398,1878,2970,1909,1941,1880,1910,1869,3096,3084,3099,3103,3098,4981,5074,5138,4983,3093,4980,4979,3102,3101,3092,4917,4913,3085,5029,3090,4922,5063,5139,5019,3086,3087,3686,3089,4880,4974,3104,5034,3091,3088,3097,3094,3095,5008,3100,2982,431,2989,3619,3074,3700,3049,3694,2030,1942,1856,1870,1859,0,94,93,3047,3073,3072,2992,1931,3606,1860,3623,1959,1979,1881,1897,2399,2567,2928,1899,1898,1952)"
        }
      }
    ]
  }
}