Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '077e3987ced37d6cd1397349a59422be9d9f3acb0f5dab7c96b5ab2bcf5c9b3a' 
  AND token = 'Sf95VXYCxwT+FE2vYTDQwOXUBd71Ac77B/OXb6BRiW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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