SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f83857f9dc93edbe95c6a4b0e6a3a9e65f533f93106267f35bbddf438b577f0' 
  AND token = 'ZcBJzlMwRj0aPBTc2g4OJKeb//TU1XyrO5wV/MhcAbU=' 
  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"
    }
  }
}