Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40ebc12597a827720c59c92f150c6a6b886e43ec52b5ee0edbf6eaecc5865d32' 
  AND token = 'DuCqxmp/86BDLpY3Ulx4pdBekTo8zaUsR+iYphl8Y+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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