Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41f51e60f7fd60ec7a9d5e4af06f67308f47dfa8e06ae86ea8d41b61d4fa1750' 
  AND token = 'a6dpMaUi48a2vXpmzd57FiAaSkml1sdLL2MynCp1AIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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