Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b253df4e6828e8303cdde79060f34288f029062b5136457fdd4761ffb6c88259' 
  AND token = 'hzEU/TXX4n9FkSOandCinkzETfwJSTqEEW+ZehPtsX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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