Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '169f4ba8c80112a0974114b9b1995fc42fd0f95dd7b0ad61f2528ad657f061ae' 
  AND token = 'OUXloQUc/lLk+ibRQ43vnpsBM2bKkk/QCK1EqcnJQcM=' 
  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"
    }
  }
}