Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af7cd4bee459e5a7a1f793956029ef9abf14525dee1bb439099045098e82f686' 
  AND token = 'SIUIBoPm0STL7oI1Wb3dPLRHiDp55gWWQN211tU/xqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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