SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c66d0d25afceff1458a70f4e2410dba7d25f73f377b91b07296e6de084db30' 
  AND token = 'IYNH/Uov8jZh1V4CbIas1nFHMUwyGqZnu4ioE7StRYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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