Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '507aba955b5266ddaa7f4254b30f1ddc1d4b219bb6184ee8c8c3b35a6f038033' 
  AND token = '8QQ57AdlWDL6XQGt7ub9wCqYyJiDyN3GYNAkmh6Dl2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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