Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4333d039907efd42ec33e0e897b5e730f91a8f94e9d8f0639a12e4da1a6fa433' 
  AND token = 'PGhlK18ODQY9dpo3XnsxVAdSFYPotttdntlwvIzM9To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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