SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8225c9c3fbbf4fa4a8cbb19622e87e03548479cdc10bbca8531337a1fd6b34be' 
  AND token = 'IQ0eoqXQUrgwCTroCqjS+VBZjEoGzKniIWEjEg49RKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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