Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40b69df7bac74ada3596bfe2ef27ed5041445b1b886a784171a9f2fee4a3abd4' 
  AND token = 'nNAw5KHMKR0NprE9kpVodwO3lX22D0w+/CXYK6RmTQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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