SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989e13e767b4e601f1d09e49f028b5fda1c76dfdfa923d57b3cd01eccf459a35' 
  AND token = '+km7t/6QV2AqCk6nhCZmYArKzJHSSf6RSzLjj7/+a4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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