Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d668d85d83d277675ef7c32d92b8e31d9ad2a7901b62a9d4fdd48f53123ec47' 
  AND token = 'cFtuf6ZWrFym+fRR+shltiXmiNFSJXTh5Qqyx+pBYec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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