Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '312771b45999ae74e9342985a8bf7c39f2878a5a58c6d6761c0ba31b2735a486' 
  AND token = 'FxvcPX2d5NvXLON7xUHIo961FD9uh2AG7tOYRU3bjWk=' 
  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"
    }
  }
}