Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e873962a7c902f406fa397dcd4043ef9fa976e5a6f1690f86f3498e42c3a1ecf' 
  AND token = 'z7zBNli6eih5fLUssL6wjBGSLOhsKCfOgVErVuXNacI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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