Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51523576a245acdfb87c7033991423f1c06ec6781334cf265820e29bb9ba0bd7' 
  AND token = 'XBWOdbz1DO7zx8Tym+5FL0UMUuQJWzmyBdIz8XOfFJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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