SELECT 
  product_id 
FROM 
  cscart_product_popularity 
WHERE 
  product_id IN (
    36578, 36579, 36580, 36581, 36582, 36583, 
    36584, 36585, 36586, 36587, 36588, 
    36589, 36590, 36591, 36592, 36593, 
    36594, 36595, 36596
  )

Query time 0.00294

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_product_popularity",
          "access_type": "range",
          "possible_keys": ["PRIMARY", "total"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "rows": 19,
          "filtered": 100,
          "attached_condition": "cscart_product_popularity.product_id in (36578,36579,36580,36581,36582,36583,36584,36585,36586,36587,36588,36589,36590,36591,36592,36593,36594,36595,36596)",
          "using_index": true
        }
      }
    ]
  }
}