Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d7f6568d32a826619b725aeded0021a154c363d6930cf7ca4c84edd6e859a2' 
  AND token = 'AEIn2gzxKTagz0oS5JCko5xxQxC799ZS5TExy54DoCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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