Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5bc13b135ff80a5562d03fdef3375626d5725adbaa98fdbd595ce55a653703' 
  AND token = 'AVEUBZGNhYG98bu+93BFtdmFDNmLnWWTwujlY4DVVv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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