Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17dea94a9fb456d4d24459ce1d0be0b4cb11991e1999368a27ba36f08c02b07a' 
  AND token = 'J5Pjm9tW7IBcnksEkMiJyvjBSNtCD3jVMHhF3jqry0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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