Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b8b3a28d9869b9f811d7f303c4e3bdff66f80b160a6e82bd3a121b0fb77a6a2' 
  AND token = 'p7VVqGm0hNUoXwuEhnvR3or4ja9h+M6YlbFTDCw7CRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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