Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b440758fb3921a65ffd2b70cecf4efe9ec7ffe7935fcd539d7760bb9793ea30' 
  AND token = 'Ie23f2q/yE0F46+hRZVSeMhSXfqCS4e6HkH9q4iO0cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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