Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ccda08fd79fed626e2fcce4763bc16d0475ee229fe204b05e62a4d871350fe4' 
  AND token = 'rcWeAZ5g9cQ2+TdWa40pz0zej7ljKuqJYtEqTJ1DxGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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