SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999222f6eea9b6f22df8f286a3073ae42fc6eedbb05b21694350741b12ee5267' 
  AND token = 'sDuOM+yKfgz7dV6N/qeKwq7tV6WH35cY3XXPhQ9ZDaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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