SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    47984, 36329, 3884, 5411, 40761, 41421, 
    40452, 38558, 1123, 6211, 3471, 3781, 
    39613, 40454, 47660, 40453, 3859, 3789, 
    2917, 2906, 3860, 6089, 14965, 6562, 
    1781, 3883, 48770, 48843, 775, 1755, 
    6212, 3620
  )

Query time 0.00208

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_products",
          "access_type": "range",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "rows": 32,
          "filtered": 100,
          "index_condition": "cscart_products.product_id in (47984,36329,3884,5411,40761,41421,40452,38558,1123,6211,3471,3781,39613,40454,47660,40453,3859,3789,2917,2906,3860,6089,14965,6562,1781,3883,48770,48843,775,1755,6212,3620)"
        }
      }
    ]
  }
}