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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a8957917502e38d2feca29f3bb17829fd074c9b0962569a7d95c9cddf8088b7' 
  AND token = '0iO34U3cTTrlSzGWkEepc+PO49zIe29tQWlVxnLwUpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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