SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    49938, 49835, 50347, 50341, 49739, 49740, 
    50136, 50527, 47094, 49738, 47092, 
    50052, 47091, 47093
  )

Query time 0.00123

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": 14,
          "filtered": 100,
          "index_condition": "cscart_products.product_id in (49938,49835,50347,50341,49739,49740,50136,50527,47094,49738,47092,50052,47091,47093)"
        }
      }
    ]
  }
}