Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '501c87f6d8d9507512b14aec5f897bc488959779e44abdbc76b1a9926f6837e2' 
  AND token = 'dQT18ZvPeljKvZOAmNTw13soa8jJVZs2vT9IXAr6ZP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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