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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df41f70c576af8c2f21d88c4850340b9bf4c0001a6afbfe132f3e219bfae1e9e' 
  AND token = '2KNELFWHJHVI2/H5kX2fmMc5NZUdb+XG5ubWvLXKaWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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