SELECT 
  snapshot_json 
FROM 
  cscart_mb_salvage_auction_snapshots 
WHERE 
  product_id = 4528

Query time 0.00008

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}