SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4493954f01e2cee8fc4009c12b7db34a391cbff797a28bc5262bac3079745e43' 
  AND token = 'ajwH0OhIBCourOVIzHuf2urSVYJqOUdqaFoZ0LwvDNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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