Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3c6caa5b2f85fd8e60c40530420f6b413bdacf22cc03f07da92d6f81e1996b' 
  AND token = 'JSd0MZbsBYJu+ovrUsrCio+Pm7Yj2VTqEiAuDz1RfTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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