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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46eba1fd4fce38ad556f53f7ea97c19cfcc106a40c31e71c3bb89078d3ff3429' 
  AND token = '1MZOpI8cpP0XGl3Ue7Z8PUuU7UoHeQvfY765ujlCReQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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