Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '802ad769d79eb6c98eaff4217475f65c4424ff6c4f405bb4f196d155000ab900' 
  AND token = 'f7EZYmKSWjOd7o91ThD00gx7PRWXcdtSMrHfG2krhBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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