Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f9ee278cd52fe850b30e7b9ff376a455273534cacf182b6d2fa2b88620c1566' 
  AND token = 'jArSOh9WUJlqXkOYH4MP8AaR52lgzn1nsn94cthmCg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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