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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '164f40127ed4d068176f057fb990e33b2446f72f4510a6255497183c6df6828f' 
  AND token = 'l+HLkBAI8iK6JL4VNcIMo24O3nitgl3f3j1RHNUI2sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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