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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09150e607d3eb5b16ff4eccd8cec30e5d4415a05d7de34db3b053f2d8e3450a6' 
  AND token = 'WEustqA/lEnXah1DKhyaEhXVa+xmvr9OJFuMMUSXm7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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