Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '849cfa725f9eb0ae4450742eefeb7485e8fe5dbbd46de82f6521bb810bdbccca' 
  AND token = 'DkbvKsBcs/b/VrxnvcMhlFw00cx9s8PZjHQCr0D5H+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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