Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '064b1a4f51426b872757dd9715ff4ed376d4d9ffddf01cb51ca0f78f3c969fc6' 
  AND token = 'IA7/WsYR1+X1lrojosV1u9mtKH+slWCd1CfIS/8Dp1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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