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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '517277dbf897a5647cf8a45694b4016f4a87395b3e9d1e9c01d349cf44fe8c31' 
  AND token = 'bdamXSh/mo7GFRT6YSXIT3D/l4Cbx4I+7/XhB/iqOyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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