Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439888eca8ac39fa198f656f1df32b898f8e2c888812cc836a43b8c4e25fe367' 
  AND token = '0Fecr0t3lTBXVScjb9lJ+Hn/G/yBcLwGyEdsFrZR6lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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