Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caad3af3c160b55ea0ddb4be888e6460acbf0836f8559f9890311364ff312fdc' 
  AND token = 'DLlV5Ie8yAViCroU4yyCRSD8DWpvU7GF/y4qm3UbV+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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