SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '416113b5445723681fd4f8acdc9f8eb87560488ae054dcb6705af523c7e22b43' 
  AND token = 'dLMTrqvljX+xCi2zkWpnLfaheTbZKT/VKSZ2Vj53Ww8=' 
  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"
    }
  }
}