Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c57410735f9bd555227c7b32de081ba1df1bf99eee5af9e988736ea610da8f4' 
  AND token = 'YYbuHngDyVX+hrp3rrIEDE5lX4g3i85T6uVVbsUc3Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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