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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833bbd87dd2c987c1800175a3a9190d9b63b33cef8db4dd3cf8c8a53cd5652d9' 
  AND token = 'AplHj68GGmuMxLby5moJ8Gj+Gv2sDSFvxT0Cm8r5nDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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