SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a2419367b6f9bf82164343c11779f24af27f3120c10687ae5ba1bd182adbb0' 
  AND token = 'JlXn0ungitLBI/trFmPld5Kuxi+Ssp/wLLpkYvD4kDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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