Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e46cecdee9442d2c2af476b7aa146802eaeb83566f6a1f2d4c2b69e6c5fa67' 
  AND token = 'PzJb+ukCMXte769R0HNp1gMKQqp6nq2t+Gh1HZtVLWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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