Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3628a3db12c6aba0259d2eb32ed13415975e1bd158c48d80decbc2ffd051eedd' 
  AND token = '3mZ0xlOQjVvxLv4ka7SeXQ8S7a+harBjoKqWMwnyESs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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