SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '724856de41a2f330f417cea430d94177573204cf36f3eff61b68fdcebb490225' 
  AND token = 'JZ0XPzTiZuY2FPJgK3C490UmRqh4wAjUxkN7xMiUVLY=' 
  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"
    }
  }
}