Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff9ca4ec442519172669b678f576e33aaa1376c5b836f8cb632ed357e83906d6' 
  AND token = 'kXW+5Dws/7Dku/YihqcgFHp7uu1N1KqHdF8hu1uH/yU=' 
  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"
    }
  }
}